EFFECTS
Contains 63 unique effects by default (with some being data-driven), which make game-play significantly more surprising as anything could happen every time an effect runs.
Effects run every 30 seconds (configurable) and by default can be anything from giving you one of every weapon to spawning a charged creeper or even dropping an anvil on you.

ONE TIME EFFECTS
These effects will only run once.
All Players Exit Vehicle - Every player exits whatever vehicle they're in
Bedrock Feet - Sets the block below the player to bedrock
Beef - Gives the player 16 cooked beef
Butter Fingers - Drops whatever item is in the players main hand
Clear Lag - Removes every dropped item
Clear Potion Effects - Clears the players active potion effects
Combo Time - Runs 2 random effects for every player
Demo Screen - Opens the demo screen
Fake Creeper - Plays the Creeper primed sound effect
Full Health - Sets the players health to full
Full Hunger - Sets the players food and saturation levels to full
Gardener - Gives the player 16 of every sapling, grow able food, and flower
Give Diamond - Gives the player a single diamond
Give Diamond Items - Gives the player one of every diamond tool
Half a Heart - Sets the players health to half a heart
Heaven - Teleports the player 100 blocks into the air
Here's Johnny - Spawns a vindicator named "Johnny" within a 10 block radius of the player
Ignite - Ignites the player
Kick - Kicks the player
Killer Bunny - Spawns a killer bunny within a 10 block radius of the player
Launch All Entities - Launches every living entity into the air
Launch Player - Launches the player into the air
Lightning - Strikes lightning at the players location
Nice Exp - Sets the players Exp level to 69
Nothing - Nothing happens
Open Random Inventory - Opens a random inventory
Random Difficulty - Sets the difficulty to something random
Set Current Vehicle - Sets the players vehicle to something random
SkyLava - Summons a block of lava 255 blocks above the player
Summon Angry Bee - Summons an Angry Bee within a 10 block radius of the player
Summon Charged Creeper - Summons a Charged Creeper within a 10 block radius of the player
Summon Creeper - Summons a Creeper within a 10 block radius of the player
Summon Random Animals - Summons 10 random animals within a 10 block radius of the player
Summon Random Hostile Mob - Summons a random hostile mob within a 10 block radius of the player (bosses excluded)
Summon Random Tree - Summons a random tree wherever the player is looking (max 10 blocks)
Trip - Drops the entire players inventory onto the ground
Watch Out - Spawns an anvil 12 blocks above the player
Weapon Giver - Gives you one of every weapon as well as 64 arrows and TNT
Zero Exp - Sets your Exp and levels to zero
Zero Hunger - Sets your hunger to zero
DamageItems - Gives random damage to the player's worn armor and their main and off hand items
DogLover - Summons 10 tamed dogs within a 10 block radius of the player
StarterPack - Gives the player iron tools as well as 10 bread and 10 torches
WingMan - Summons a tamed parrot within a 10 block radius of the player
MysteryEffect - Activates a completely random effect, without saying what

TIMED EFFECTS
Timed effects run for 90 seconds (configurable) after they've been started.
Blindness - The player is given the Blindness potion effect
Gotta Go Fast - The player is given the Speed potion effect
Haste - The player is given the Haste potion effect
Invisible Entities - All living entities are made invisible
Invulnerable Entities - All entities are made invulnerable
Invulnerable Player - The player is made invulnerable
Mining Fatigue - The player is given the Mining Fatigue potion effect
Night Vision - The player is given the Night Vision potion effect
Pacifist - If the player hurts an entity or another player they're killed and set on fire
Vampirism - The player can only gain health by damaging mobs
Where Did Everybody Go - Every living entity is hidden from the player
Adventure - Sets the player's game-mode to adventure​